*{
    margin: 0px;
    padding: 0px;
}
h1{
    text-align: center;
    margin: 0px 20px;
}
.father{
    width: 70%;
    margin: auto;
    padding: 100px;
}
table{
    width: 100%;
    text-align: center;
}
#tablehead{
    background: #d3d3d3;
}
tr:nth-of-type(2n+1){
    background: #8df08c;
}